My dad (in his late 70's) has for a while been invested in an Eaton Vance Muni Bond fund -- EIM. In recent weeks, the fund has been tanking. I am by no means an expert in bonds or bond funds, so thought I would ask the board why this recent severe dip might be occurring. What are the factors behind it? Is this a time to get out, or to hold fast and wait for a rebound?